Operator register-sender controlled telephone switching system



June 13, 1950 H. w. BALzER 2,511,145

OPERATR REGISTER-Smm CONTROLLED TELEPHONE SWITCHING SYSTE 17Sheets-Sheet 1 Filed Jan. 13, 1948 om SEO EQ; BN

June 13, 1950 H. w. BALzER 2,511,145

orm'ron REGISTER-swam commun TELEPHONE swrrcumc svs'ma 17 Sheets-Sheet`2 Filed Jan. 13, 1948 INVENTOR Harvey W Holzer AHys June 13, 1950 H. w.BALzER 2,511,145

CPERTOR REGISTER-SEWER CONTROLLED TELEPHONE SWITCHING SYSTEM Fudd Jan,1s, 194s 17 Sheets-Sheet 3 n n! VIE.

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OPERATOR REGIS? 17 Sheets-Sheet 5 Filed Jan. 13, 194B Oom 4to ZQtmOamobmao Harvey W Balzer KAOMYM Atrys June 13, 1950 H. w. BALZER OPERATORREGISTER-'SENDER CONTROLLED TELEPHONE SWITCHING SYSTEM Filed Jan. 13,1948 17 Sheets-Sheet 6 H. w. BALZER 2,511,145 oPERA'roR REGISTER-saunacoNTRoLLED TELEPHONE swI'rcHING SYSTEM June 13, 1950 1'7 Sheets-Sheet 8Filed Jan. 13, 1948 INVENTOR. Harvey W Bolzer NWS H. w. BALzER 2,511,145ommox REGISTER-samen comoLwu TELEPHONE swrrcamc ssm 1v shun-sn. s

June 13, 1950 Fund Jan. 1s. 194s INVENTOR Harvey W Balzer Oouf-fwL H. W.BALZER EGIST June 13, 1950 2,51 1,145 OPERATOR R ER-SENDBR CONTROLLEDTELEPHONE swI'rcHING SYSTEM 17 Sheets-Sheet 10 Filed Jan. 13, 1948Aftys,

17 Sheets-Sheet 11 Cm: 2:1 u ($5: 2N 2: mo: .3 Fsvw Moa 50G 5 1: ggg?me: $86 2:: 5 (wo: NSG

LZER ENDEZR CONTROLLED TCHING SYSTEM H. W. BA REGISTER-S GFERATORTELEPHONE SWI INVENTOR. Harvey W Balzer BY M, 064W M Atys June 13, 1950Filed Jan. 1:5. 194s June 13, 1950 1-1. w.BA1 zER 2,511,145

OPERATOR REGISTER-SENDER CONTROLLED TELEPHONE SWITOHING SYSTEM FiledJan. 13, 1948 1'7 Sheets-Sheet 12 Atfys June 13, 1950 H, w, BALZER2,511,145

OPERATOR REGISTERSENDER CONTROLLED TELEPHONE SWITCHING SYSTEM Filed Jn.13, 1948 17 Sheets-Sheet 13 ^`Tum 'lmsel |381 lmea START DIGIT SENDER *iI maeo I l ML' |322 3 SPACE Artys June 13, 1950 Filed Jan. 13, 1948 H.W. BALZE OPERATOR REGISTER-SENDER CONTROLLED TELEPHONE SWITCHING SYSTEM17 Sheets-Sheet 14 FIG.

June 13, 1950 H. w. BALZER 2,511,145 oPmToR REGISTER-Smm: com'RoLLEnTELEPHONE swz'rcamc sysma Filed aan. 1s, 1948 17 Sheets-Sheet l5JNVENTOR.

Hervey W Balzer BY M. 0640A #en/v6 ATM/S June 13, 1950 H. w. BALZER2,511,145

OPERATOR REGISTER-SEWER CONTROLLED TELEPHONE SWITCHING SYSTEM Filed Jan.13, 1948 17 Sheets-Sheet 16 DIGIT REGISTERS i CIOI4 FIRST DIGIT SECONDREGISTER M630 D|G|T REG.

INVENTOR. F Horvey W Bulzer Bv l nuL I 06am M AIIyS TELEPl-IONESWITCHING SYSTEM 17 Sheets-Sheet 17 Filed Jan. 13, 1948 INVEN TOR.Hervey W. Bolzer FIG. \7

Patented June 13, 1950 OPERATOR REGISTER-SENDEB CON- TROTLLED TELEPHONESWITCHING SYS EM Harvey W. Balzer, "Downers Grove, Ill., asslgnor toAutomatic Electric Laboratories In cago, IIL, a corporation ApplicationJanuary 13, 1948, Serial N0. 2,118

(Cl. "Q -27) 40 Chim..

The present invention relates to toll switching systems and moreparticularly to such systems including switchboards of the cord circuittype provided with register-sender apparatus.

It is an object of the present invention to provide in a toll switchingsystem including a switchboard of the cord circuit type, an improvedregister-sender arrangement controllable from the switchboard andoperative to send digits over a cord circuit thereat to associatedautomatic switching apparatus.

Another object of the invention is to provide a toll switching system ofthe character noted. wherein the sender comprises improved facility forreleasing the associated register in the event registration of thedigits at the switchboard is begun before the connected link or cordcircuit thereat has been connected to the associated automatic switchingapparatus.

Another object of the invention is to provide a toll switching system ofthe character noted, wherein the sender comprises improved facility forreleasing the associated register in the event the connected link orcord circuit at the switchboard is disconnected from the associatedautomatic switching apparatus prior to the sending of all of the digitsregistered in the register.

Another object of the invention is to provide a toll switching system ofthe character noted, wherein the sender comprises improved facility forreleasing the associated register in response to the operation of arelease device or error key at the switchboard.

Another object of the invention is to provide in an automatic telephonesystem, a sender comprising improved facility responsive to the returnof delay and ready signals from the associated switching apparatus forselectively controlling the sending operations thereof.

Another object of the invention is to provide in an automatic telephonesystem, a sender comprising improved facility responsive to the returnof a busy signal from the associated switching apparatus for releasingthe associated register.

A further object of the invention is to provide a sender of thecharacter noted, wherein the various timing intervals required thereinfor control purposes are obtained by operation of a set of countingrelays therein through corresponding counting cycles. which set ofcounting relays is also employed for counting impulses incident tosending of a digit from the sender.

A further object of the invention is to provide in a toll switchingsystem including a switchboard, an improved arrangement responsive tothe connection of a link at the switchboard to a o! Delaware ceive adigit.

A further object of the invention is to provide in a toll switchingsystem including a switchboard provided with therebetween.

Further features oi' the invention pertain to the particular arrangementof the circuit elements of the system, whereby the above-outlined andadditional operating features thereofl are attained.

Sect. 1.-The general arrangement of the telephone system The invention,both as to its organization and method of operation, together withfurther objects and advantages thereof, will best be understood byreference to the following speciiication taken in connection with theaccompanying drawings, in which Figure 1 is a schematic diagram of thearea served by a telephone system embodying the present invention andillustrating thereof stations of of; the toll line sinus repeatersdisposed in the C. 9, taken together, illustrate of the outgoing trunkcircuits disposed in the cena tral ofiice; Figs. and 1l, taken together,illustrate the details oi the cord and sender contr circuit associatedwith the iirst operator position disposed at the toll board in thecentral omce; Figs. 12 to l5, inclusive, illustrate the details o! oneoi the digit senders associated with the first operator positiondisposed at the toll board in the central oiilce; and Figs. 16 and 17,taken together. illustrate the details o! one of the digit registersassociated with the ilrst operator position disposed at the toll boardin the central ofllce.

Referring now more particularly to Fig. l. the telephone system thereillustrated serves an area comprising a central cnice Ill, a distantomce Il, a remote oilice 30 and a C. A. X lll. The central omce III isof the automatic type serving subany suitable type, including thesubscriber substation Till; the distant oiilce Il is of any suitabletype serving substations. not shown: the remote oiiice Sil is o! anysuitable type serving substations, not shown; and the C. A. X I0 is ofthe automatic type serving substations of any suitable type, includingthe subscriber subsubstation TIM. The central omce Ill comprises amanual toll board ll oi the key sending type; the distant ofllce 2Bcomprises a manual toll board llt of any suitable type: and the remoteoiiice any suitable type. The central omce III and the distant omce 21|are interconnected by a group ot toll lines, including the toll linelil; the central omce III and the remote cnice 30 are interconnected bya group of toll lines, including the toll line nl; and the centraloffice It and the C. A. X I0 are interconnected by a group of trunklines. including the trunk line 1 it.

In the central omce lil the subscriber substations TIM, etc.. havesubscriber lines lll, etc., extending thereto that are provided withindividually associated line circuits |03, etc. Also the central cniceIII comprises a local switch train including groups oi finder-selectorlinks and grups or connectors, not shown. One of the groups offinder-selector links includes the link illustrated comprising the nnderIl! and the selector llis and is provided with an associated distributor4M, also connected to the line circuits 40S, etc., in the groupassociated with the group subscriber line Tlli.

Accordingly, allotted by the distributor 4M; and the finder Illthereoi.l has access to the group of subscriber lines including thesubscriber line 402. Also the central omce il comprises a toll switchtrain includo! combination connectors, one oi the groups including thecombination connector l of subscriber lines. including the subscriberline |02. Further the toll switch train includes a group of incomingselectors, including the incoming selector lit, and a group of tollselectors. including the toll selectors M1. The combination connectors|01, etc., are accessible to the selectors IIII, etc.. of the group oi'under-selector links mentioned. to the group o! incoming selectors llt,etc.. and to the group ci toll selectors H1, etc.

The toll lines III, etc., extending between the central oiilce i0 andthe distant oiiice 2l are terminated in repeaters at the opposite endsthere- Il! being terminated in the rapeeters Il! and 4H respectivelydisposed in the distant oiilce it and in the central odlee Il. Therepeater li! is accessible to the toll board lil via a trunk Il I; andthe repeater lil is connected by a trunk llt to the incoming selectorIII individual thereto. The toll lines lll, etc., exthe central oiliceIl and the remote oiilce 30 are terminatedinring-down toll line endsthereof; the toll line ring-down toll line circuits 2M and 282respectively disposed in the central oiilce Ill and in the remote oilice3l. The ring-down toll line circuit 2li is accessible to the toll board20| via a. trunk individual thereto: while the ringdown toll linecircuit I is uccessible to the toll board 50 via a trunk Ill individualthereto, the trunk 208 being terminated in a lack Jll disposed at thefirst operator position at the toll board Sli. extending between thecentral oilice il and the C. A. X lll are terminated in toll linecircuits lilll. etc., disposed in the central oillce Il and in repeaters1ML etc., disposed in tbe`C. A. X Il. The toll line circuit MIU isaccessible to the i011 board 50 via a rst trunk "i individual thereto,635 being terminated in a jack JMD disposed at the iirst operatorposition at the toll board lll. Also the toll line circuit il. ilaccessible to the incoming selectors III, etc., vll. a second trunk istindividual thereto. Further the central oilice Il comprises a group o!outgoing trunk circuits, including the outgoing trunk circuit lill,respectively associated with the group oi toll selectors, including thetoll selector M1. More particularly, is individually connected to thetoll selector lll by a trunk lll and is accessible to Il via a trunkindividual thereto, the trunk mentioned being terminated in a lack JOI!disposed at the nrst operator position at the toll board Il. Also thecentral oice It comprises a group oi.' C. L. R. trunk circuits,including the C. L. R. trunk circuit |00. The C. cessible via a C. L. R.trunk Il. to the selectors lill, etc., oi the group of mentioned; and isalso accessi El via a trunk individual thereto, the trunk mentionedbeing terminated by a jack JM. disposed at the mst operator position atthe toll board 5l.

In the central oiilce III, the toll board 5l comprises a number ofoperator positions, including the nrst operator position indicated thatls provided with the operator position circuit lll, the operatortelephone circuit 2li, the cord and sender control circuit llllll andthe group of cord circuits, including the cord circuit #L At the iirstoperator position at the toll board Il, the position circuit I and thetelephone circuit lll are interconnected with each other and arecommonly connected to the group ot cord circuits, including the cordcircuit #L Also the position circuit lll and the telephone circuit Illare respectively connected to the cord and sender control circuit |000:and the control circuit lill is respectively connected to each oi thecord circuits in the group, including the cord circuit #L Purther thecord and sender control circuit Il is individually ru'ovided with thedigit sender #I and the digit sender #2. which, in turn, areindividually connected to the digit register #l #2. In vieuy o! theloregoing, it will be appreciated that each operator position at thetoll board Il comprises a position circuit, a telephone circuit. a cordand sender control circuit. a group of cord circuits. two digit sendersand two digit registers. Moreover, it will anni be understood that theanswering oi' calls, the initiation oi' calls and the extension of callsfrom each position at the toll board 50 is identical to thecorresponding operations at the ilrst operator position illustrated: andin the interest oi brevity only the operations perfumed at the rstposition at the toll board 50 will be discussed.

In the C. A. X 40, the subscriber substations TI, etc., have subscriberlines 102. etc., extending thereto that are provided with individuallyassociated line circuits 102, etc. Also the C. A. X 40 comprises a localswitch train including groups oi' iinder-selector links and groups ofconnectors, not shown. One of the groups oi' linderselector linksincludes the link illustrated comprising the ilnder |05 and the selector105, and is provided with an associated distributor 104, also connectedto the line circuits 105, etc., in the group associated with the groupof subscriber lines. including the subscriber line 102 `extending to thesubscriber substation T10I. Accordingly, the lnder-selector linkillustrated is allotted by the distributor 104: and the nnder 105thereof has access to the group of subscriber lines. including thesubscriber line 102. Also the C. A. X 40 comprises a. toll switch trainincludlng groups of combination connectors, one of the groups includingthe combination connector 101 having access to the group oi subscriberlines, including the subscriber line 102. The combination connectors101, etc., are accessible to the selectors 105, etc., ot the group ofilnder-selector links mentioned. Also in the C. A. X 40 the repeeters100, etc.. are provided with trunk line circuits 125, etc., the repeater|00 being individually connected to the trunk line circuit 125. Also therepeaters 100, etc., are accessible to the selectors 108, etc. of thegroup of finder-selector links mentioned via trunks 1|5, etc.,individual thereto; while the trunk line circuits 125, etc., areaccessible to the ilnders 105, etc., of the group of lnder-selectorlinks mentioned. Finally.

the trunk line circuits 125, etc., are also connected to the distributor104.

Sect. 2.--The apparatus incorporated in the telephone system In thecentral oi'ilce I0. the operator telephone circuit 200 comprises, asshown in Fig. 2, a repeating coil 255, a transmitter T205, a receiverR205. two jacks J200 and J2I0, two plugs P201 and P205, and a relaycircuit including a talk relay R2I0, a monitor relay R220 and a. batterysupply relay R230.

The operator position circuit 500 comprises. as shown in Fig. 5, a keygroup including a split rear key X505, a split iront key X555. anautomatic ring key X553 and a send rear key X554; and also a relay groupincluding a rear control relay R5I0, a rear supervisory relay R520, arear split relay R525. a front split relay R550, a front supervisoryrelay R535, a front control relay R540 and two pad relays R550 and R550:as well as a pad including the elements 545, 5I1 and 5Il. Further theoperator position circuit 500 comprises a key set KI000 of conventionaltype. indicated in Fig. l0, that includes ten individual digit keys. anerror key, and a call completed key or button.

The cord circuit #I comprises, as shown in Fig. 3, a rear or normalanswer plug P30I, a iront or normal call plug P202, a rear supervisorylamp L303, and a iront supervisory lamp L504: and a key group includinga talk key Kill, a monitor key K2", a ring rear key Kill and a ringiront key Kilt; as well as a connect relay R520 The cord and sendercontrol circuit |000 comprises, as shown in Figs. 10 and ll, a sender #Ilamp LI02I, a sender #2 lamp LII2I, a sender #I check key KI025. asender #2 check key KII25, a sender #I cut-out key KI001, and a sender#2 cut-out key KI000. Also the cord and sender control circuit |000comprises a plurality of relay groups individual to the cord circuits inthe associated group; the group individual to the cord circuit #Iincluding the #I cord relay RI |40, the #I cord #I send relay RI and the#I cord #2 send relay RI |50. Also the cord and sender control circuit|000 comprises a group of relays individual to the digit sender #I andincluding the connect rear #I send relay RI050, the select #I relayRI010 and the connect #I relay RI 000; and a group of relays individualto the digit sender #2 and including a connect rear #2 send relay RI|10, a select #2 relay RI |05 and a connect #2 relay RI |00. Finally,the cord and sender control circuit |000 comprises a common group oirelays including a send rear relay R|040, a send iront relay RIMS, atalk relay R|050, a ready relay RI 055, two sequence relays RI |00 andRI |05 and a start relay RI |00` The digit sender #2 and the digitregisters #2, diagrammatically illustrated in Fig. 7, are respectivelyidentical to the digit sender #I and the digit registers #L The digitsender #I comprises. as shown in Figs. 12 to 15, inclusive, a relaygroup including a call complete relay RI2I0, a shunt relay RI2I5, anerror relay RI220, a stop send relay RI225, two error relays RI220 andRI240, a test relay RI250, a release relay RI250, an initial space relayRI3I0, a control relay RI220, a shunt slave relay Bw50, a blocked sendrelay RI340, two control relays RI350 and RI350, a hold relay RI310, astart relay RI300, a transfer relay RI4I0, an automatic ring relayRI420, a control relay RI430, two alternate relays RI440 and RI450, animpulse relay RI450, two cycle relays RI410 and RI4B0, two transferrelays R|520 and RI525, five counting relays RI530, RI535, RI540, RI545and RI550, and a control relay R|555. The digit registers #i comprise,as shown in Figs. i6 and 17, a ilrst group of three individual digitregisters, an intermediate group oi three individual digit registers,and a last group of three individual digit registers. The groups ofindividual digit registers are identical; and only the first group ofthree individual digit registers have been illustrated. The first digitregister comprises four mark relays IX, IY, IZ and IW, a release relayRIBIO, a transfer relay RI620 and a connect relay RI630; similarly, thesecond digit register comprises four mark relays 2X, ZY, 2Z and 2W, arelease relay RI64Il, a transfer relay RI550, and a connect relay RI660; and similarly the third digit register comprises four mark relays3X, SY, SZ and 3W, a release relay RI1I0, a transfer relay RI120 and aconnect relay RI130.

The C. L. R. trunk circuits are identical to the C. L. R. trunk circuit400, shown in Fig. 4, that comprises the terminating jack .i440 disposedat the ilrst operator position at the toll board 50 and an associatedanswer lamp L44I. Also the C. L. R. trunk circuit 4I0 comprises arepeating coil 430 and a relay group including a line relay R450, are-ring relay R455, a hold relay R450, an answer relay R465, a seizerelay R410, a drain relay R415 and a jack relay R400.

The toll line circuits are identical to the toll line circuit 000, shownin Fig. 6, that comprises

